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[Vision AI] Korean ANPR OCR Engine, Regex Normalization & Temporal Majority Voting (v01 to v11 Evolution) (#5)

· 3 min read
Jihwan Park (jaybee)
Jihwan Park (jaybee)
AI & Robotics Engineer

Temporal Majority Voting and Final Confirmation

📌 Key Takeaways (TL;DR)

  • Problem: Single-frame OCR inevitably suffers from transient misreadings (e.g., 64아1511, 24가1511) due to vehicle yaw, glare, and vibration.
  • Solution: Implemented Korean plate regex validation (^\d{2,3}[가-힣]\d{4}$) coupled with a temporal sliding window majority voting engine across a 7-frame buffer (plate_confirm_threshold=3).
  • Result: Advanced through 11 system iterations (v01 to v11), transitioning from initial gibberish (ACCIIXOY-1Z01...) on June 5 to deterministic confirmation of 64가1511 on June 7 with 99.4% reliability.